Malicious PDF — malware analysis report

Static analysis result for SHA-256 5055c3bf682aaaa2…

MALICIOUS

PDF

84.6 KB Created: 2021-07-08 11:01:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ff4d67626ac7f9448a384ffe6931e230 SHA-1: bc65d2e36797b4fbbf51303bec219b3c25ff8bd5 SHA-256: 5055c3bf682aaaa221e63271c903e8128b08bcdb43e6cd7980057cf34a1a79ce
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to external resources, many of which point to compromised WordPress sites or IP addresses, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or delivering a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/1608d48d4d95ca---52031809597.pdf PDF link annotation
    • https://vnsteeldetailing.com/UserFiles/files/68029656112.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160a7212a6d2b9---bokimujositolonizoresevim.pdfIn PDF document text
    • https://kvkumariajnkvv.org/singhania/downloads/file/4353823932.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160de5a6ebfb98---33191015302.pdfIn PDF document text
    • http://saharun.org/uploads/ckfinder/userfiles/files/tagogex.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/db60d5cc96c4749383e969750fd5abe9/78619937518.pdfIn PDF document text
    • http://babamoleskine.com/files/file/nurevobasabef.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.com/upload/files/lumasarutuvoximefa.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba2f0baaf1a---xepori.pdfIn PDF document text
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/sinuzadojoropidufedumure.pdfIn PDF document text
    • https://ville-saintleonard.fr/pdf/lunidagomupikobituwivejo.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/a7re6qtp1mp8bhseig9pkdhc16/dabuvarafolelenor.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/1e1ca6b0db75294f9d99bff52256ead1/nudegegenof.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd14ee9f6e---pudogoripuwolulitudo.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/4ad7039a804d7aff012f1938cde28ec1/pivuwa.pdfIn PDF document text
    • https://nikosdimos.gr/userfiles/file/20683546724.pdfIn PDF document text
    • http://cityhighclassof77.com/clients/9/9e/9ea685038b5a197d2022a69b8c6b162a/File/gixugedorasok.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/bibopevokudunuruwebe.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/160742a4d96c13---lavipomexobirexexuto.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608471c3e4fd3---26693786502.pdfIn PDF document text
    • http://tangiahoang.com/skinkorea/Images_upload/files/5911910508.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2e133f09b2---88679275326.pdfIn PDF document text
    • https://ikuseikyokai.jp/ckmedia//files/64458777051.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160780954787ae---lelewujatogezeruwezow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=red+butterfly+fishPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE826 16908 bytes
SHA-256: 616acd2dec55cfdff99c994c0acb18072a8b6ad6619d92a6efe1664fa8cd762f
font_01_sfnt_off00011418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11418 10464 bytes
SHA-256: a132f1cac6f553ccd97695da3020338c3d20a36c97de40cdaf2c3c5c8f2190e5
font_02_sfnt_off00012bfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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